Soft-shell crab (soft crab). Soft-shell crab is not a special species of crab, nor is the crab shell softened with chemicals. Crabs are crustacean things, in the process of growth, in order to continuous growth needs, it is necessary to replace the original old shells, after replacing the old shells, the new shells in a certain environment and time, the new shells are soft, we call this soft body of the crab soft-shell crab. Soft-shell crabs are rich in nutrients, even the shells can be eaten, we can ingest from the shells the sixth life element that the human body lacks - chitin. Chitin is animal cellulose, in nature, only exists in crustaceans, chitin has a great effect on the human body, can detoxify and nourish the face, lower fat and blood pressure, lower cholesterol, and can improve the body's immune system. It is the most natural weight loss food in the world except for exercise. It does not have any side effects on the body. In addition, the soft-shell crab is rich in free calcium, is the best food for the elderly children calcium.